Download Data Sheet Features General Description

Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
General Description
Features
The AP3211 is a 1.4MHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 1.5A load with high efficiency,
excellent line and load regulation. The device
integrates N-channel power MOSFET switch with
low on-resistance. Current mode control provides fast
transient response and cycle-by-cycle current limit.
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A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3211. This feature greatly simplifies the
design of switch-mode power supplies.
AP3211
Input Voltage Range: 4.5V to 18V
Output Voltage Adjustable from 0.81V to 15V
Fixed 1.4MHz Frequency
High Efficiency: up to 92%
Output Current: 1.5A
Current Mode Control
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Built-in UVLO Function
Built-in Over Voltage Protection
Built-in Soft-start
Applications
The AP3211 is available in SOT-23-6 package.
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LCD TV
DPF
Portable DVD
SOT-23-6
Figure 1. Package Type of AP3211
Apr. 2013
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Mark
BS
1
6
SW
GND
2
5
IN
FB
3
4
EN
Figure 2. Pin Configuration of AP3211 (Top View)
Pin Description
Pin Number
Pin Name
1
BS
2
GND
3
FB
4
EN
5
IN
6
SW
Apr. 2013
Function
Bootstrap pin. A bootstrap capacitor is connected between the
BS pin and SW pin. The voltage across the bootstrap capacitor
drives the internal high-side NMOS switch
Ground pin
Feedback pin. This pin is connected to an external resistor
divider to program the system output voltage. When VFB exceeds
20% of the nominal regulation value of 0.81V, the OVP is
triggered. When VFB＜0.25V, the oscillator frequency is lowered
to realize short circuit protection
Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.4V shuts down the IC. When the IC is
in shutdown mode, all functions are disabled to decrease the
supply current below 1μA
Supply input pin. A capacitor should be connected between the
IN pin and GND to keep the DC input voltage constant
Power switch output pin. This pin is connected to the inductor
and bootstrap capacitor
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3211
Ordering Information
AP3211
-
Circuit Type
G1: Green
Package
K: SOT-23-6
TR: Tape & Reel
Package
Temperature
Range
Part Number
Marking ID
Packing
Type
SOT-23-6
-40 to 85°C
AP3211KTR-G1
GCI
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Apr. 2013
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Pin Voltage
VIN
-0.3 to 20
V
EN Pin Voltage
VEN
-0.3 to VIN+0.3
V
SW Pin Voltage
VSW
21
V
Bootstrap Pin Voltage
VBS
-0.3 to VSW+6
V
Feedback Pin Voltage
VFB
-0.3 to 6V
V
Thermal Resistance
θJA
220
ºC/W
Operating Junction Temperature
TJ
150
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering,
10sec)
TLEAD
260
ºC
ESD (Human Body Model)
2000
V
ESD (Machine Model)
200
V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Input Voltage
VIN
4.5
18
V
IOUT (MAX)
1.5
TA
-40
Maximum Output Current
Operating Ambient Temperature
Apr. 2013
Rev. 1. 4
A
85
ºC
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Electrical Characteristics
VIN=VEN=12V, VOUT=3.3V, TA=25ºC, unless otherwise specified.
Parameter
Input Voltage
Quiescent Current
Symbol
VIN
IQ
Shutdown Supply Current
ISHDN
Feedback Voltage
VFB
Feedback Over Voltage Threshold
VFBOV
Feedback Bias Current
Conditions
IFB
Min
Typ
4.5
mA
VEN=0V
0.1
1.0
μA
0.810
0.835
V
0.785
0.972
VFB=0.85V
-0.1
Switch Leakage Current
ILEAK
VIN=18V,
VEN=0V
0.1
Switch Current Limit
ILIM
1.8
VENH
1.5
Oscillator Frequency
μA
Ω
10
μA
2.4
A
V
VENL
VHYS
V
0.1
0.35
Input UVLO Hysteresis
V
1.1
ISW=1A
VUVLO
18
0.8
RDSON
Input UVLO Threshold
Unit
VFB=0.9V
Switch On-resistance
EN Pin Threshold
Max
0.4
VIN Rising
3.3
3.8
4.3
V
0.2
fOSC1
1.1
1.4
V
1.7
MHz
fOSC2
Short Circuit
460
kHz
Max. Duty Cycle
DMAX
VFB=0.6V
90
%
Min. Duty Cycle
DMIN
VFB=0.9V
0
%
Minimum On Time
tON
100
ns
Thermal Shutdown
TOTSD
160
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
tSS
200
μs
Soft-start Time
Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design.
Apr. 2013
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics
TA=25ºC, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted.
1.10
90
1.05
80
1.00
Quiescent Current (mA)
100
Efficiency (%)
70
60
50
40
30
VIN=12V,VOUT=3.3V
20
VIN=12V,VOUT=5V
10
0
0.01
0.1
0.5
1
0.95
0.90
0.85
0.80
0.75
VIN=12V
0.70
VFB=0.9V
0.65
VEN=5V
0.60
-60
2
-40
-20
0
20
40
60
80
100
120
140
160
o
Temperature ( C)
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. Quiescent Current vs. Temperature
3.8
0.96
3.6
0.88
Output Voltage (V)
Feedback Voltage (V)
3.4
0.80
0.72
0.64
0.56
0.48
3.2
3.0
2.8
2.6
VIN=12V, VOUT=3.3V
2.4
0.40
-60
-40
-20
0
20
40
60
80
100
120
140
2.2
0.0
160
Temperature ( C)
Figure 6. Feedback Voltage vs.Temperature
Apr. 2013
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
Output Current (A)
o
Figure 7. Output Voltage vs. Output Current
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted.
3.8
3.0
3.7
2.8
2.6
Maximum Output Current (A)
3.6
Output Voltage (V)
3.5
3.4
3.3
3.2
3.1
3.0
2.9
IOUT=1.2A
2.8
IOUT=1.5A
2.7
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
VOUT=3.3V
0.6
0.4
0.2
2.6
4
6
8
10
12
14
16
18
4
20
Figure 8. Output Voltage vs. Input Voltage
VOUT (AC)
20mV/div
VSW
5V/div
8
10
12
14
16
18
20
Figure 9. Maximum Output Current vs. Input Voltage
VOUT (AC)
100mV/div
IL
1A/div
IL
1A/div
VIN
10V/div
Time (100μs/div)
Time (400ns/div)
Figure 10. Output Ripple (IOUT=1.5A)
Apr. 2013
6
Input Voltage (V)
Input Voltage (V)
Figure 11.Load Transient (IOUT=1 to 1.5A)
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted.
VEN
3.4V/div
VOUT
1V/div
VEN
3.8V/div
VOUT
1V/div
VSW
5V/div
VSW
5V/div
IL
1A/div
IL
1A/div
Time (10μs/div)
Time (100μs/div)
Figure 12. Enable Turn-on Characteristic
(Resistance Load, RLOAD=2.6Ω)
Figure 13. Enable Turn-off Characteristic
(Resistance Load, RLOAD=2.6Ω)
VOUT
2V/div
VOUT
2V/div
VFB
1V/div
VFB
1V/div
IL
1A/div
IL
1A/div
VSW
10V/div
VSW
10V/div
Time (400μs/div)
Time (400μs/div)
Figure 15.Short Circuit Recovery (RLOAD=2.6Ω)
Figure 14. Short Circuit Protection (IOUT=1.5A)
Apr. 2013
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted.
VFB
500mV/div
VFB
500mV/div
VOUT
2V/div
IL
1A/div
VOUT
2V/div
IL
1A/div
VSW
10V/div
VSW
10V/div
Time (200μs/div)
Time (20μs/div)
Figure 16. Over Voltage Protection (IOUT=1.5A)
Apr. 2013
Figure 17. Over Voltage Recovery (IOUT=1.5A)
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Typical Application
Figure 18. Typical Application Circuit of AP3211
Apr. 2013
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.100(0.122)
0.300(0.012)
0.500(0.020)
6
0.200(0.008)
5
4
2
3
0.300(0.012)
0.600(0.024)
Pin 1 Mark
1
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
Apr. 2013
Rev. 1. 4
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Data Sheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211
Mounting Pad Layout
SOT-23-6
Dimensions
Value
Apr. 2013
Z
(mm)/(inch)
3.600/0.142
G
(mm)/(inch)
1.600/0.063
X
(mm)/(inch)
0.700/0.028
Rev. 1. 4
Y
(mm)/(inch)
1.000/0.039
E
(mm)/(inch)
0.950/0.037
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